package com.itheima.bigevent.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.itheima.bigevent.mapper.ArticleMapper;
import com.itheima.bigevent.pojo.Article;
import com.itheima.bigevent.pojo.PageBean;
import com.itheima.bigevent.service.ArticleService;
import com.itheima.bigevent.utils.ThreadLocalUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;
import java.util.Map;

@Service
public class AricleServiceImpl implements ArticleService {
    @Autowired
    private ArticleMapper articleMapper;

    // 新增文章
    @Override
    public void add(Article article) {
        // 补充属性
        article.setCreateTime(LocalDateTime.now());
        article.setUpdateTime(LocalDateTime.now());
        // 获取用户id
        Map<String, Object> map = ThreadLocalUtil.get();
        Integer userId = (Integer) map.get("id");
        article.setCreateUser(userId);

        articleMapper.add(article);
    }

    // 分页查询列表
    @Override
    public PageBean<Article> list(Integer pageNum, Integer pageSize, Integer categoryId, String state) {
        // 1. 创建pageBean对象
        PageBean<Article> pb = new PageBean<>();

        // 2. 开启分页查询 ，需要导入 PageHelper依赖
        PageHelper.startPage(pageNum,pageSize);

        // 3. 调用mapper
        Map<String,Object>  map = ThreadLocalUtil.get();
        Integer userId = (Integer) map.get("id");
        List<Article> as = articleMapper.list(userId, categoryId, state);
        // Page中提供了方法，可以获取PageHelper分页查询后，得到的总记录数和当前页数据
        Page<Article>   p = (Page<Article>) as;

        // 4. 把数据填充到PageBean对象中
        pb.setTotal(p.getTotal());
        pb.setItems(p.getResult());

        return pb;
    }
}
